<d-button bsStyle="common" bsSize="xs" style="margin-right: 4px"> Extra small</d-button>
<d-button bsStyle="common" bsSize="sm" style="margin-right: 4px"> Small </d-button>
<d-button bsStyle="common" style="margin-right: 4px"> Middle </d-button>
<d-button bsStyle="common" bsSize="lg"> Large </d-button>
